1. Acute angle- the angle which measures less than 90 degree is called acute angle.

2. Right angle- the angle which measures exactly 90 degree is called right angle.

3. Obtuse angle- the angle which measures more than 90 degree but less than 180 degree is called obtuse angle.

4. Straight angle- the angle which measures exactly 180 degree is called straight angle.

5. Reflex angle- the angle which measures more than 180 degree but less than 360 degree is called reflex angle.

6. Complete angle- angle which measure exactly 360 degree is called complete angle